Clothing & Wearables calculator
What Bra Cup Size Do I Need?
Enter full bust circumference, snug underbust circumference, and sizing region to work out bra cup sizing measurements.
Enter your measurements
This page is built for one question: what bra cup size do i need? Supply full bust circumference, snug underbust circumference, and sizing region, then use the returned bra cup sizing measurements to screen unsuitable options.
- Full bust circumference — Required
- Snug underbust circumference — Required
- Sizing region — Optional
Bra cup sizing measurements
Enter the measurements above to calculate bra cup sizing measurements.
How the calculation works
V16 calculation/specification: measurementDifference=bust-underbust; return bust,underbust,measurementDifference,region as the bra-cup sizing profile; cup lettering must be taken from the selected brand and region chart because cup progressions vary.
Worked example
Example: Full bust circumference = 96 cm; Snug underbust circumference = 82 cm; Sizing region = UK. Result: Measurement Difference = 14 cm. Final labelled size/compatibility must be checked against the exact current manufacturer, brand or governing-body chart.
Before you decide
Recheck the limiting measurement before purchase or installation. Use the current manufacturer, brand, league or governing-body specification for the final labelled size or rule; those external charts can change and are not treated as universal constants. For what bra cup size do i need, the limiting result on this page is bra cup sizing measurements.
Runtime-specific source required. Use the exact current manufacturer, brand, model, regional conversion, league or governing-body chart/rule that applies to the user's actual product or competition; a single static URL would be misleading.
Frequently asked questions
What does the Bra Cup Size calculator tell me?
It returns bra cup sizing measurements from the measurements entered on this page. The calculation is specific to bra cup size, so the result should be compared with the exact product or specification you are considering.
Which measurements should I take for bra cup size?
Measure full bust circumference, snug underbust circumference, sizing region. Use clear, usable dimensions rather than nominal room or product labels.
Why doesn't the calculator force a universal bra cup size size label?
Because labelled sizing varies between brands, models, leagues or governing bodies. The tool returns the measurements or requirements needed to make a reliable chart comparison.